János Kollár is Professor of Mathematics at Princeton University. He has received the Cole Prize (2006), the Nemmers Prize (2016), and the Shaw Prize (2017). He is the author of more than 200 articles and ten books, mostly on algebraic geometry.

'This book dismantles the final, most daunting barriers to learning about moduli of higher dimensional varieties, from the point of view of the Minimal Model Program. The first chapter draws the reader in with a compelling history; a discussion of the main ideas; a visitor's trail through the subject, complete with guardrails around the most dangerous traps; and a rundown of the issues that one must overcome. The text that follows is the outcome of Kollár's monumental three-decades-long effort, with the final stones laid just in the last few years.' Dan Abramovich, Brown University

• Introduction; Notation; 1. History of moduli problems; 2. One-parameter families; 3. Families of stable varieties; 4. Stable pairs over reduced base schemes; 5. Numerical flatness and stability criteria; 6. Moduli problems with flat divisorial part; 7. Cayley flatness; 8. Moduli of stable pairs; 9. Hulls and husks; 10. Ancillary results; 11. Minimal models and their singularities; References; Index.

János Kollár is Professor of Mathematics at Princeton University. He has received the Cole Prize (2006), the Nemmers Prize (2016), and the Shaw Prize (2017). He is the author of more than 200 articles and ten books, mostly on algebraic geometry.

'This book dismantles the final, most daunting barriers to learning about moduli of higher dimensional varieties, from the point of view of the Minimal Model Program. The first chapter draws the reader in with a compelling history; a discussion of the main ideas; a visitor's trail through the subject, complete with guardrails around the most dangerous traps; and a rundown of the issues that one must overcome. The text that follows is the outcome of Kollár's monumental three-decades-long effort, with the final stones laid just in the last few years.' Dan Abramovich, Brown University

• Introduction; Notation; 1. History of moduli problems; 2. One-parameter families; 3. Families of stable varieties; 4. Stable pairs over reduced base schemes; 5. Numerical flatness and stability criteria; 6. Moduli problems with flat divisorial part; 7. Cayley flatness; 8. Moduli of stable pairs; 9. Hulls and husks; 10. Ancillary results; 11. Minimal models and their singularities; References; Index.

János Kollár is Professor of Mathematics at Princeton University. He has received the Cole Prize (2006), the Nemmers Prize (2016), and the Shaw Prize (2017). He is the author of more than 200 articles and ten books, mostly on algebraic geometry.

'This book dismantles the final, most daunting barriers to learning about moduli of higher dimensional varieties, from the point of view of the Minimal Model Program. The first chapter draws the reader in with a compelling history; a discussion of the main ideas; a visitor's trail through the subject, complete with guardrails around the most dangerous traps; and a rundown of the issues that one must overcome. The text that follows is the outcome of Kollár's monumental three-decades-long effort, with the final stones laid just in the last few years.' Dan Abramovich, Brown University

• Introduction; Notation; 1. History of moduli problems; 2. One-parameter families; 3. Families of stable varieties; 4. Stable pairs over reduced base schemes; 5. Numerical flatness and stability criteria; 6. Moduli problems with flat divisorial part; 7. Cayley flatness; 8. Moduli of stable pairs; 9. Hulls and husks; 10. Ancillary results; 11. Minimal models and their singularities; References; Index.